If they smashed it..............they buy you a new one. I've killed parts working on cars, I buy new ones. No stand up shop would argue . If they argue about this..................I would be concerned about their build more than the cost of a new sensor. How exactly did they hurt the sensor? They are pretty well protected. Most shops do not time the sensor unless they are installing and starting the engine. YOU MUST prime the oiling system before start up which requires the cam sensor to be out. If you are installing the engine it is up to you to prime the system and install and time the cam sensor. Not really hard to do. If you need verbal instruction on how to do this, drop me a pm for my phone number and I'll be happy to walk you through it over the phone.